My problem is similar, although I'm not sure that it is just the fan. I had someone come to check it and they said that the "defrost control board" was bad. They replaced it and the unit seemed to work for a short time, but now we are back to square one. If this thing burned up another control board, what should I do? Could it be something else?

My problem is similar, although I'm not sure that it is just the fan. I had someone come to check it and they said that the "defrost control board" was bad. They replaced it and the unit seemed to work for a short time, but now we are back to square one. If this thing burned up another control board, what should I do? Could it be something else?

We need a bit more diagnostics than simply the fan won't come on. I'm sorry. There are many things that can cause this. If the outside unit comes on but the indoor unit does not blow air than we can be assured that there is control voltage up to the thermostat and power to the indoor unit. So what we need to doo is verify if there is power, 24 volts getting fro "R" to "G" at the stat and then also at the indoor unit. If this is so then there only remains three possibilities, a bad fan control board, faulty wiring to the fan motor or a faulty fan motor. This is the diagnotics ahead of you.

If you have any questions feel free to contact me directly...

Richard (Rick) DrennanGlobal HVAC DistributorsRUUD Field Support Representative / Instructorrdrennan@globalhvac.com900 Spreckels AveManteca, Ca. 95336Office (877)448-7263Cell (209)456-0513We need a bit more diagnostics than simply the fan won't come on. I'm sorry. There are many things that can cause this. If the outside unit comes on but the indoor unit does not blow air than we can be assured that there is control voltage up to the thermostat and power to the indoor unit. So what we need to doo is verify if there is power, 24 volts getting fro "R" to "G" at the stat and then also at the indoor unit. If this is so then there only remains three possibilities, a bad fan control board, faulty wiring to the fan motor or a faulty fan motor. This is the diagnotics ahead of you.
If you have any questions feel free to contact me directly...

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Related Questions:

H is most likely for heat pump, meaning error 5 on outdoor unit. My guess would be low pressure since your power to the indoor unit most likely comes from the outdoor unit. Check manual for codes or research model number error codes.

Hi,
Your unit is running in heat pump mode...hope you knew that you had a heat pump...
Anyway the problem would either be the thermostat or the reversing valve...
It will take some detective work to figure out exactly which is causing your problems...

The indoor fan will continue to run. When heat pump goes into defrost the outdoor fan stops, the reversing valve switches and the unit is basically working in the cooling mode. In order for you not to feel a blast of cold air in the winter the electric strip heat also comes on so the indoor fan must run while the strip heaters are on.

When the unit heats inside, the outdoor unit cools, and if the outdoor cooling coil gets too cold the system turns off indoor fan, and changes gas flow direction to de-ice the outdoor coil. Ensure both coils, and the filters are clean and if there is still a problem check system gas pressure for leaks.

It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.

check your house circuit breakers first that should be labeled heatpump or outdoor unit
make sure it is on and or not tripped
then if you have a box outside near the outdoor unit open it up and see if there is a breaker or maybe fuses that could be blown

Is it noisy always when running in heat or only for intermittant periods? Depending on where you live every 45-90 minutes of run time the heat pump goes into a cycle called defrost. The fan on the outdoor unit will shut off. the compressor will continue to run but in actually cool mode. this heats the outdoor coil and allows any frost or ice that is built up on the outdoor coil to melt. The compressor can get pretty loud in this mode and you may actually see steam coming off of the unit. This is normal. However if it is noisy all of time in heat check/clean your coils. If this doesn't remedy it have your refrigerant charge checked by a NATE certified Service Technician. Good luck.

this happens when the outside temp is low, asthe outdoor unit blows cold when in heating (reverse) then the unit goes to pre def to avoid it freezing. You should hear a whoosh this is the heat being blasted to the outdoor unit to defrost it, then the heat has to build up again before the indoor unit fan runs up again and blows heat. Mine does the same every 20 mins or so (its -2 outside) brrrr
Leigh

You are going to have to increase the amount of heat absorbed by the evaporator coil on the indoor section of your system. First change the filter. Second turn the power off to the outdoor section and leave the indoor fan running until all the ice on the evaporator coil has thawed this could take a few hours. Third you need to verify that you are getting adequate airflow across the indoor evaporator coil and the outdoor condenser coil both fans should be spinning at full speed and airflow should be unobstructed by dirty coil fins or debris Hopefully after you've done this you will have cold air blowing inside and the larger of the two lines entering the unit outside will be cool to the touch but not frozen or even frosted regardless of run time and the small one should be the slightly warm but not hot. If the larger line continues to freeze then it could indicate a number of problems but essentially your condensers cooling capacity is outrunning your evaporator coils ability to absorb heat from air stream circulating in your home.Hope it works out for you GL!